Alicia...To make the Middle piece (with the hole in it) I traced the Top piece and added 1 3/4" to the bottom so it is slightly bigger than the Top piece. If you look at the picture of the Middle piece (4th picture in the tutorial) there is a pencil line marking where the TOP piece came to, so you can see the added 1 3/4".

Could you please explain where I should cut the middle piece hole? you said you used trial and error, but is there perhaps anyway you could specify where it should be and maybe how large it should be for your head. Thank You!!